Separation Activities and Initial Public Offering (Initial Public Offering) (Details) (USD $)	Dec. 31, 2013	Feb. 06, 2013 Common Class A	Feb. 06, 2013 Common Class B	Feb. 06, 2013 IPO Common Class A
Class of Stock [Line Items]
Common stock, shares issued	500,007,428			99,015,000
Share price				$ 26.00
Common stock, shares outstanding	500,007,428	99,015,000	400,985,000